Drillina mechanism



May 26, 1931. r. R. E. RUNDQvlsT 1,806,765

DRILLING MECHANISM Filed June l0, 1925 4 Sheets-Sheet 1 May 26, 1931. l T. R. E.I RUNDQVIST 1,806,755

DRILLING MECHANISM Filed June l0, 1925 4 Sheets-Sheet 2 l E zg ,s Y

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May 26, 1931. T. R. E. RUNpQvlsT 1,806,765

DRILLING MEGHANISM Fild June l0. 1925 4 sheets-sheet s :May 26, `1931. T. R. E. RuNDQvls'r 1,806,765

l DRILLING uEcHANIsu Filed June 10, 1925 4 Sheets-Sheet 4 /1 Harm/Og Patented May 1931 UNITED stares Partnrv oFFlcs THORE E. RUNDQVST, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN MAGHNERY COMPANY, A CORPORATION 0F MASSACHUSETTS DRILLING MEGHANISM Application led June 10, 1925. Serial No. 36,261'.

-My invention relates to drilling mechanisms.

In drilling, especially in nitrate or other similar material, it is desirable to drill holes of comparatively large diameter and of moderate depth. To accomplish this it has heretofore been necessary to utilize a drill mounting` having relatively high upstanding supports or guides for the drilling mechanism and it has been found that such an arrangement is bulky and somewhat top heavy Vespecially during transport of the -drill up or down steep inclines or overrugged surfaces.

Among the objects of the present invention are the provision of means for swinging the guiding frame for the drilling mechanism downwardly, thus lowering the center of gravity of the drill during transport. Another object of my invention is to provide an improved drilling mechanism having improved feeding and drill actuating connections. Still another object of my invention is to provide an improved drilling mechanism having the drill guiding frame pivoted for angular adjustment relative to thesupporting frame and which has improved feeding and drill actuating connections which are operative irrespective of the angular adjusted position of the guiding frame. A still further object of my invention is to provide an improveddrilling mechanism having improved independent rotation means for the drill bit. These and other objects and advantages of my invention will, however, hereinafter more fullyappear.

Myinvention, in one'of its aspects, comprises improved means for angularly adjusting a drill guiding frame relativeto a supporting frame while constantly maintaining operative driving connectons for the feeding and drill actuating mechanism.l More specifically, this improved means comprises a supporting frame of the track-laying tread driven type by which a power unit carried and on which a drill guiding frame is pivotally connected for angular adjustment rel- The feeding' means for the f ative thereto. j drill comprises a usual tractor pulley which is operatively connected to va driven' pulley,

the latter being mounted concentric with the pivotal axis of the guiding frame. The

guiding frame or standard comprises a plurality of columns, herein in the form of feed screws, rigidly connected together at their ends and by which the drill bit actuating mechanism iscarried. Transmission shafts aro arranged parallel to the feed screw columns and are operatively connected to the source of power through suitable chain and gear connections of improved form. During transport the guiding frame is adapted to be swung downwardly, thus forming a low and compact unit having a relatively low center of gravity, consequently facilitating the transport of the machine over inclined or rugged surfaces. l/Vhen it is 'desired to operate the drill the guiding frame may be swung upwardly with facility into its operative position and rigidly locked therein.

In the accompanying drawings I' have shown for purposes of illustration one form which my invention mayassume in practice. i

In these drawings,- Y

` Fig. l is a side elevation of my improved drilling mechanism with the drill standard disposed in its lowered position,the'elevated position of this standard being indicated by dotted lines with the drill actuating mechanlsm shown in raised position.

Fig. 2 is a detail centrallongitudinal sectional view illustrating a portion of my improved feeding mechanism, the view being taken substantially on line 2-2 of Fig. (i.

Fig. 3 is an enlarged. detail elevational view, partially shown in section, of a portion of my improved feeding and drill actuating mechanism.

'Fi`g. l is a transverse horizontal sectional view taken substantially on line 4 4 of Fig.

'3 illustrating a portion of my improved independent drill bit rotation means.

Fig.-` 5 is a fragmentary elevational view of the improved means for preventing reciprocation of the drill bit during rotation thereof.`

Fig. 6l is a transverse horizontal sectional view taken substantially on line 6 6 of Fig. 3.

Fig, 7 is a transverse horizontal sectional CFI Cil

view taken substantially on line 7-7 of Fig. 3.

Fig. 8 is a detail sectional view of the improved raising and lowering means for the drill guiding frame, the view being taken substantially on line 8-8 of Fig. 3.

Fig. 9 is a detail central longitudinal sectional view taken substantially on line 9-9 of Fig. 6.

Fig. 10 is a plan view of the drilling mechanism shown in Fig. 1, parts being broken away and omitted to facilitate illustration.

In this illustrative embodiment of my invention I have shown a truck frame 1 supported on usual track-laying treads 2 and by which a power unit 3 is supported. A usual driving pulley 4 projects laterally from the side of the power unit and is adapted to be actuated by the latter in a well known inanner. The track-laying treads are adapted to be driven from the power unit 3 through any suitable connections including flexible drive chains 5. As illustrated, mounted upon the truck frame 1 is a pair of parallel I-beams G rigidly secured to the truck frame in any suitable manner and upon which the power unit 3 may be supported at their forward ends.

In my improved construction l have provided a supplemental or drill guiding frame or standard, generally designated 7, pivotally connected to the truck frame 1, as at 8, for angular adjustment relative thereto. More specifically, this drill guiding frame comprises a yoke-shaped hollow base casting 9 having laterally projectingT cylindrical trunnions 10 liournaled within suitable bearing blocks 11 rigidly secured to the upper surfaces of the -beams 6. It will herein be observed that formed on the base casting 9 are laterally proecting lugs 12 which are adapted to rest on and to be secured to the beams G. Suitable upstanding bosses 13 are also formed integral with the base casting and within which stationary feed screws 14 and 15 are secured herein by thread and bolt connections 16 and 17 respectively. T he upper ends of the feed screw columns 14 and '15 are rigidly secured, as by key and nut connections 18, within a yoke-shaped top casting 19. The drill actuating mechanism is supported upon the feed screw columns in an improved manner to be hereinafter more fully described.

Improved means are provided for angularly usting the drill guiding frame 7 relative to the truck frame 1 and which comprises a worm gear or rack 2O rigidly secured, as by bolts 21, to a radial iiange 22 preferably formed integral with one of the trunnions 10 for the drill guiding frame 7. As illustrated, a worm 23 is meshed with the worm gear and this worin is suitably secured to a vertically disposed shaft 24 journaled at its upper and lower ends, preferably in ball bearings 25 and 26, respectively (see Figs. 3 and 8). Suitably secured to the upper end of the shaft 24 is a worm gear 27 with which a worm 28 is meshed and which worm is secured to a transversely disposed horizontal shaft 29. Suitably secured to the outer end of the shaft 29 is an operating lever or crank 30. It will herein be noted that the gearing above described is suitably housed within a dust tight casing 31 herein preferably formed integral with one of the bearing blocks 11. From the foregoing description it will be evident that when the operatin g member is actuated by the operator, and consequently the gears 28, 27, 23, and 20, the drill guiding frame may be swung in any desired manner about its pivotal aXis 8 relative to the truck frame 1.

In specifically describing my improved drill actuating mechanism it will herein be observed that power is adapted to be transmitted from the tractor driving pulley 4 through a belt connection 35 to a larger driven pulley 36 mounted concentrically with the trunnion pivot 8 and which pulley is suitably secured to a transversely disposed horizontal transmission shaft 7 suitably journaled at its ends, preferably in ball bearings, as at 38 and 39, herein suitably carried within the hollow base frame 9. Operatively connected to the inner end of the shaft 37 is a chain sprocket 40 from which power is transmittable through a chain connection 41 to a similar chain sprocket 42 suitably secured to a shaft 43 disposed parallel with the shaft 37 and the trunnion pivot 3, which shaft 43 is suitably journaled in ball bearings 44 carried within the base casting (see Figs. 6 and 9). Suitably secured at the inner end of the shaft 43 is a bevel pinion 45 which is herein meshed with reverse bevels 4G and 47 loosely journaled on a transmission shaft 43 disposed parallel with the feed screw columns 14 and 15. It will herein be noted that the shaft 48 is journaled in any suitable manner at its lower and upper ends within the lower and upper castings 9 and 19, respectively. As shown, disposed coaxially with the shaft 48 and interposed between the reverse bevels 46 and 47 is a suitable friction clutch, generally designated 49, by which the 1' verse bevels 4G and 47 are adapted to be selectively connected in operative driving relation with the shaft 48 to drive the latter in opposite directions from the bevel drive pinion 45. Any approved means including an operating member 50 may be provided for actuating the friction clutch 49. As illustrated, splined, as at 51, in operative sliding relation with the shaft 48 and adapted to be driven thereby is a bevel pinion 52 which is ineshed with a bevel gear 53 suitably keyed, as at 54, to one end of a horizontally disposed crank shaft 55. As illustrated, the crank shaft 55 is journaled at its ends within roller bearings 56 carried, respectively, within a suitable detachable cover or cap `member 57 and the main drill casting or frame, genorally designated 58, and by which the drill bit actuating mechanism per se is carried in an improved manner. Suitably secured to the end of the crank shaft 55 opposite from the Y tion, Ser. No. 472,546, filed May 25, 1921, further detailed discussionof the saine is 3elieved unnecessary other. than to say that a drill bit carrying drill rod 64 is operatively connected to a piston 63 reciprocating in the cylinder and is adapted to be reciprocated thereby. The piston rod is hollow as indicated in dotted lines and has an extension 64' cooperating with a sleeve 64b for supplying fluid from acompartinent 64c for cleaning the cuttings from a drilledrhole. The compartment 64c is formed by the partition 64d in the cylinder. Cleansing fluid may be supplied to this compartment by any suitable means such as described in the application referred to above. The cylinder 63 is provided with integral rectangular guide portions 65 slidably mounted withina correspending rectangular guiding portion 66 formed integral with the casting 58 (see Fig.

3). From the foregoing description it will be evident that when the gear 45 is being driven and when one or the other of the reverse bevels 46 and 47 are selectively connected to the shaft 48, the cranl; shaft 55 and consequently the drill cylinder 63 may be actuated as desired.

Associated with my improved drill'actuating mechanism is improved feeding means which specifically comprises-a bevel gear 70 which is meshed with the reverse bevels 46 and 47 and driven thereby (see Fig. 6). The gear 70 is suitably connected to the inner end of a transversely disposedshaft 71 disposed coaxially with the shaft 43 and which shaft 71 is journaled in a suitable roller bearing 71a carried by the base frame 9. `As illustrated, suitably secured to the outer end of the shaft 71 is a bevel pinion 72 which is meshed with reverse bevels 73 and 74 loosely journaled on a shaft 75 disposed transversely of the shaft 71 (see Figs. 2 and 6)'. The opposite ends of the shaft 75are jour-- naled within suitable roller bearings 76 likewise carried within the base frame 9. Disposed coaXially with the shaft 75 and interposed between th'e reverse bevels -7 3 and 74 is a suitable friction clutch, generally-designated 77, substantially similar to the fric- A tion clutch 49 heretofore described, and by which the gears 73 and 74 are vadapted to be connected in driving relation with the shaft 75. The clutch 77 is adapted to be actuated by a suitable shipper member 78 operated by an operating member or lever 79. As illustrated, secured to one end of the shaft 75 is a bevel pinion 80 (see Fig.'2) which is meshed with a bevel gear 81 keyed, as at 82, to the lower end of a transmission shaft 83 disposed parallel with the feed screw columns 14 and 15 and the transmission shaft 48. The lower end of the shaft 83 is journaled within suitable ball bearings 84 while the upper end of 1' the shaft is suitably ournaled withinthe upper yoke casting 19. Splined in sliding relation to the shaft 83, as at 85, is a spur pinion y86 (see Fig. 7) `which is suitably journaled within the main casting 58 of the drilling mechanism per se. The gear 86 is meshed with a larger spur gear 87 (see Figs. 3 and 7 formed integral with a rotatable feed nut 88 threadedly connected, as at 89, to the stationary feed screw 14. It will herein be noted that carried within the casting 58 at the ends of the nut 88 are suitable ball thrust bearings 90 by which the thrust of the drill is taken. Formed integral with the nut 88 and above the gear 87 is a chain sprocketV 91 which is operatively connected by a transversely disposed chain connection 92 with a similar chain sprocket 93 formed integralwith a rotatable feed nut 94, similar to the-nut 88 and driven by the latter. The nut 94 is threaded- 1C" lyvconnected, as at 95, to the stationary feed screw 15. From the foregoing description it will be evident that when the bevel pinion 72 is being driven from the power unit 3 and when one or the other of the reverse bevels 73, 74 are operatively connected to the shaft 75 power may be transmitted through the bevels 80 and 81 and the shaft 83 to the feed nuts 88 and 94, rotating the latter relative to the stationary feed screws, thus causing the drill carrying frame 58 and consequently the bit carrying drill rod 64 Vto be fed upwardly or downwardly as desired. It will herein be noted that secured to the end of ,the shaft 75 opposite from the bevel pinion 80 is a hand wheel 96 (see Fig. 2), thus enabling the shaft 75 and consequently the feed nuts 88 and 94 to be manuallyrotat'edand consequently the drill manually fed as desired.

vAssociated with theiinproved drill actuating mechanism are improved means for independently rotating the drill rod 64 and this means specificallyy consists of a chain sprocket suitably secured to the crank shaft 55 suitably secured to a transversely disposed shaft 103 journaled within suitable bearings 104 carried within a head or closure member 105, the latter being secured within the lower end of the rectangular guiding portion G6 of the frame casting 58. Suitably secured to the shaft 103 intermediate its ends is .a worm 10G which is meshed with a worm gear 107 disposed coaXially with the drill rod G4 and splined in sliding' relation with respect thereto, as at 108. It will thus be evident that when the cylinder 63 is reciprocated the drill rod 64 is simultaneously positively rotated.

Pivotally mounted upon the lower side of the head 105 is a projecting finger 109 having an actuating handle 110 adapted to be held in one or a plurality of positions as by a usual manually operable pin and slot connection 111 as clearly shown in Fig. 5. The plurality of notches shown are adapted to permit holding of the drill steel 64 at different elevations to facilitate any operation thereon which might be deemed necessary, such for instance, as removing or replacing the usual drill bit not shown. The finger 109 when operative is disposed within an annular recess 112 formed in the upper end of a chuck member 113 by which the drill rod 64 is carried, and the cylinder 63 may thus be reciprocated without reciprocating the drill rods. During such an operation the relative movement between the cylinder and piston merely serves to compress air in the ends of the cylinder which may if desired be supplied by suitable valve mechanism to the compartment 64c for cleaning cuttings from a drilled hole. As this specific mechanism is clearly described and claimed in my copending application, Ser. No. 751,237, filed Nov. 21, 1924, further detailed description of the same is herein deemed unnecessary. It will thus be evident that the drill tube 64 may be held against reciprocation while it is independently rotated through the improved independent rotation means including the chain 101 heretofore described, driven from the crank shaft 55. It is to be noted that 'the drill rod may be rotated in opposite directions by means of the reverse bevels 46, 47 and the friction clutch 49, thus permitting the proper screwing or unscrewing of the drill bits or the drill rod sections.

It will herein be noted that the actuating gears for the shafts 48 and 83 are suitably housed within the dust tight hollow base casting 9 and that suitable collapsible dust bellows 114 and 115 surround the feed screw columns 14 and 15 and the transmission shafts, thus preventing access of dust or other foreign substance to the threads of the screws. It will further be noted that the feed nuts and the -drill actuating mechanism are all enclosed within the dust tight casing 58.

In the operation of my improved drilling mechanism it will herein be noted that when the mechanism has been transported under its own power to the desired location the operator manipulates the actuating lever 30, rotating the worm gear 20 and thus causing the guiding frame 7 to be swung upwardly about its pivot 8 into its operative drilling position as indicated clearly by dotted lines in Fig. 1, the lugs 12 on the base frame 9 being rigidly secured in any suitable manner to the -bcams G, as bv bolts, at that time. The desired reverse bevel is then operatively connected with the shaft 75 and the feed shaft 83 is consequently actuated, thus causing the feed nuts 88 and 94 to be rotated and the drill fed upwardly to the top of the guiding frame. The feed is then thrown out and the drill bit carrying rod is secured within the chuck 113 and the desired reverse bevel 73, 74 is then operatively connected to the drill actuating shaft 48 and the drill rod is consequently reciprocated in the desired manner. The feed nuts 88 and 94 are then again rotated in the required direction and the drill bit is fed downwardly at the desired drilling speed. During the drilling operation the drill rod is rotated continuously by means of my improved independent positive rotation mechanism. If it is desired to ream the hole, the finger 109 is inserted within the groove 112 in the chuck 113 and the rod is prevented from reciprocation, the drill being fed upwardly and downwardly in the hole as the drill rod rapidly rotates, thus performing a reaming funetion. When it is desired to again transport the drill to another working place the operator then swings the guiding frame downwardly in transport position, as indicated in full lines in Fig. 1, the feed screws 14 and 15 straddling the power unit- 3 at this time, thus forming a very low and compact mechanism, it also being understood that the drill cylinder 63 and the supporting frame 58 are at the lower end of the guiding frame at that time to clear the power unit 3. It will also be noted that if it is desired to rotate the drill rod 64 in opposite directions the friction clutch 49 may be operated as desired and the desired reverse bevel 46, 47 may be connected to the actuating shaft 48.

As a result of my invention it will herein be noted that improved feeding and drill actuating connections are provided which may be operated irrespective of the angular position of the guiding frame relative to the truck frame. It will further be noted that improved drilling mechanism is provided which is of a comparatively compact and low structure which may be transported with facility and which may be adjusted into its operative drilling position ezqaeditiously. It will still further be noted that all the actuating parts are enclosed within dust tight casings or bellows, thus preventing entrance of foreign matter to the moving parts and thereby increasing the life of the same.

These and other advantages `of my invenmay be modified and embodied in 'various' other forms without departing from its spirit or the scope of the appended claims.

What I claimV as new and desire to secure by Letters Patent is:

Il. A drilling mechanism comprising a truck including a power driving element, a guiding frame pivotally mounted thereon, drill bit reciprocating mechanism including a rotatable drive element slidably guided byV said guiding frame, means for feeding said drill reciprocating mechanism relative to said guiding frame, and operative driving connections between said power driving element and said mechanism.

2. A drilling mechanism comprising a truck having a power driving element, a guiding fiame pivotally connected to said truck, drill bit reciprocating mechanism including -a rotatable drive element slidably guided by said frame, means for feeding said drill reciprocating mechanism relative toi said guiding frame, and driving connections betweensaid power driving element and said mechanism operative irrespective of the -angular truck.

3. A drilling mechanism y, comprising Va truck includingpa power driving element, a guiding frame pivotally mounted thereon, drill bit reciprocating mechanism including a rotatable drive element slidably guided by said guiding frame,'nieans for feeding said position of said fra-me relative to said drill reciprocating mechanism relative to said guiding frame, and operative driving connectionsincluding a friction clutch between said power driving element and said mechanism. Y

4. A drilling mechanism comprising a truck including a power driving element, a guiding frame pivotally mounted thereon, mechanism including afrotatable drive element for percussivcly actuating and rotating a drill bit slidably guided by said guiding frame, means for feeding said drill actuating and rotating vmechanism relative to said guiding frame, and operative driving connections including reversing mechanism'between said powerfdriving element and said actuating mechanism.

5. A drilling mechanism comprising a truck having a power driving element, a guiding frame pivotally mounted thereon, mechanism including a rotatable drive element for percussivelyactuating and rotating a drill bit slidably guided by said'guiding frame, means for feeding said drilly actuating and rotating mechanism relativeV to saidv guiding frame, and operative driving connections between said power driving element and said actuating mechanism includ-l ing a driven element disposed concentrically with said frame pivot. f

6. A drilling` mechanism comprising a truclr having a power driving element, a guiding frame pivotally connected to said trucli, mechanism including a rotatable drive clement for percussively actuating and rotating a drill bit slidably Vguided by said frame, means for feeding said drill actuating and rotating mechanism relative to said guiding frame, and driving connections between said power driving element and said actuating mechanism operative irrespective of the angular position of saidv frame relative to said truck, said driving connections including a vdrivengelement disposed concentrically with said framepivot.

7. A drilling mechanism comprising a tractor having a power driving pulley, a guiding frame adjustably mounted on said tractor, mechanism including a rotatable drive element for percussively actuating a drill bit slidably guided by said frame, operative driving connections between said pullley and said actuating mechanism, and mechon said base, mechanism for percussively actuating a drill bit carried by said frame, means for feeding` said actuating mechanism relative to said frame, and operative driving connections between said vpower driving 'element and said actuating mechanism and feeding means. Y

10.'A drilling mechanism comprising a tractor having a power driving element, a guiding frame pivotally mounted oii said tractor, mechanismv forV percussively actuating a drill bit carried by said frame, and means driven from saidv power driving element and including a rotatable member carried by said actuating mechanism for feeding the latter relative to said frame. y Y 111 A drilling mechanism comprising a tractor having a power driving element, a guiding frame V.pivotally mounted on said iio tractor, mechanism for percussively actuating a drill bit carried by said frame, and means driven from said power driving element and including a rotatable member carried by said actuating mechanism for feeding the latter relative to said frame irrespective of the angular position thereof relative to said tractor.

12. A drilling mechanism comprising a tractor having a power driving element, a guiding frame pivotally mounted on said tractor, drill bit actuating mechanism carried by said frame, and means including a stationary feed screw carried by said frame, and a cooperating feed nut carried by said actuating mechanism for feeding the latter relative to said frame.

13. A drilling mechanism comprising a tractor having a power driving element, a feeding frame pivotally mounted thereon and having a stationary feeding element, drill bit actuating mechanism carried by said frame and having a rotatable feeding element cooperating with said stationary element, and operative driving connections between said power element and said rotatable feeding element including a driven element disposed concentrically with said frame pivot. 14. A drillingr mechanism comprising a tractor, a guiding frame pivotally mounted thereon, drill bit reciprocating and rotating mechanism carried thereby, means for feeding said mechanism relative to said frame.l and means including reversible friction controlled gearing for driving said mechanism.

15. A drilling mechanism comprising a tractor having a power driving element, a guiding frame pivotally mounted thereon, mechanismI for percussively actuating a drill bit carried by said frame, and means driven by said power driving element for feeding said actuating mechanism relative to said frame irrespective of the angular position thereof relative to said tractor.

16. A drilling mechanism comprising a movable base frame, a feeding frame pivotally mounted thereon, drill bit actuating mechanism carried by said feeding frame, and means for feeding said actuating mechanism relative to said feeding frame including a stationary feed screw carried by the latter.

17. A drilling mechanism comprising a movable base frame, a feeding frame pivotally mounted thereon, drill bit actuating mechanism carried by said feeding frame, and means for feeding said actuating mechanism relative to said feeding frame including a feed nut carried by said actuating mechanism.

18. A drilling mechanism comprising a movable base frame, a guiding frame carried thereby and angularly adjustable relative thereto, mechanism including a rotatable drive element for percussively actuating a drill bit slidably guided by said guiding frame, means for feeding said drill actuating mechanism relative to said guiding frame, and means carried by said base frame for driving said actuating mechanism irrespective of the angularI adjustment of said guiding frame with respect to said base frame.

19. A drilling mechanism comprising a movable base frame, a standard carried thereby, drill bit actuating mechanism carried by said standard, means for feeding said actuating mechanism relative to said standard including a transmission shaft disposed longitudinally of and journaled on the latter, and means for driving said actuating mechanism comprising a shaft disposed parallel with said feed shaft.

20. A drilling mechanism comprising a movable base frame, a standard pivotally mounted thereon, drill bit actuating mechanism carried by said standard, and means for feeding said actuating mechanism relative to said standard including a plurality of stationary feed screws carried by the latter.

21. A drilling mechanism comprising a movable base frame, a power driving element lixediy secured to said frame, a standard pivoted on said base frame, drill bit reciprocating mechanism slidably guided by said standard, means for feeding said drill reciprocating mechanism relative to said standard, means for adjusting said standard relative to said base frame, and operative driving connections between said power driving element and said reciprocating mechanism.

22. A drilling mechanism comprising a movable base, a standard thereon, drill bit reciprocating mechanism carried by said standard and including a rotatable shaft, positive rotation means operated independently of any reciprocating action of said mechanism for rotating the drill bit coniprising a driving element disposed coaxially with and driven by said shaft, a driven element disposed coaxially with and operatively connected to the drill bit, and a cooperating iiexible transmission element connecting said driving element with said driven element.

23. A drilling mechanism comprising a movable base, a standard mounted thereon, mechanism carried by said standard for .reciprocating the drill bit including a rotatable shaft, means for positively continuously rotating the drill bit including means driven from said shaft, and means for locking the drill bit against reciprocation.

24. A drilling mechanism comprising a movable base, a standard thereon, mechanism carried by said standard for percussively actuating a drill bit and including a rotatable element, and continuous positive rotation means for the drill bit including connections distinct from said percussiv-e mechanism comprising an element driven by lUU ard comprising means for reciprocating the drill bit, a rotatable shaft, and positive rotation means for the drill bit operating independently of the reciprocating action of theV latter and comprising a driving element disposed coaxially with and driven by said shaft, and connections between said driving element and the drill bit.

261A drilling mechanism comprising` a movable base, a standard thereon, drill bit actuating mechanism carried by said standard comprising `means for reciprocating the drill bit including a rotatable shaft, and positive rotation means for the drill bit operating independently of the reciprocating action of the latter and comprising a driving element disposed coaXially with and driven by said shaft, a driven element also distinct from said reciprocating means and disposed coaxially with and operatively connected to the drill bit, and driving connections between said driving element and said driven element.

27. A drilling mechanism comprising a movable base frame, a standard thereon, drill bit actuating mechanism' carried by said standard, means for feeding vsaid actuating mechanism relative to said standard includving a stationary element, and collapsibleV housing mea-ns for said element.

28. A drilling mechanism comprisingV a standard, drill bit actuating mechanism carried by said standard, means for feeding said actuating mechanism relative to said standard including a feeding element, and collapsible housing means foi` said element disposed between said standard and a portion of said actuating mechanism.

29. A drilling apparatus comprising a base frame, mechanism carried thereby for positively reciprocating a drilling tool, means driven by an element of said recipr0- cating mechanism for causing continuous rotation of said drilling tool on its axis during reciprocation thereof, and means for interrupting reciprocation while permitting rotation of said drilling tool. Y

30. ln a drilling apparatus, a. portable base, a guiding standard mounted. thereon, tool reciprocatinfr mechanism slidably mounted on said standard, an engine on said base, rotating driving connections between said tool reciprocating mechanism and said engine, and mechanism driven directly from said rotating driving connections for rotating the tool. Y

3l. In a drilling apparatus, a portable base, a guiding standard mounted thereon,

longitudinally on said standard, an engine on said base, mechanism for feeding said tool reciprocating mechanism relative to `said standard, driving connections between said engine and said tool reciprocating mechanism and said feeding mechanism, and

Vmechanism driven by said driving connec-V tions for rotating the tool.

n testimony whereof I aflix my signature.

THORE R. E. -RUNDQVISTL aA tool reciprocating mechanism movable Cir Sli) 

